Pulverized-coal-burning boiler furnace



Feb. l0, 1931. o. DE LoRENzl 1,792,104

PULVERIZD COAL BURNING BOILER FURNACE Filed June 18y 1926 2 Sheets-Sheetl O. DE LORENZI PULVERIZED COAL BURNINGBOILER FURNAQE Filed June 18,1926 2 Sheets-Sheet 2 c 1 O O /5 ooooclooooooooooo Feb. 1o, 1931.

lNvENToR lt? a BY ATTORNEYS rarement Fee. 1o, 193i megan UNITEDsrATEs-'PATENT oFFrc-E OTTO DE LORENZI, OF MAPLEWOOD, NEV JERSEY,ASSIGNOR TO INTERNATIONAL COM- BUSTION ENGINEERING CORPORATION, OF NEWYORK, N. Y., A CORPORATION OF DELAWARE Application led June 18,

This invention relates to boiler-furnaces and to the firing of the same,and is especially useful where the fuel is to be burned in space, as,for example, when the fuel is in the form of powdered coal.

One of the primary objects of my invention is to eliciently fire aboiler of this character.

The foregoing, together with such other objects and advantages as mayhereinafter appear, or are incident to my invention, I obtain by meansof a construct-ion which I have illustrated in the preferred form in theaccompanying drawings, wherein- Fig. 1 is a vertical section through aboilerfurnace embodying` my improvements, and

Fig. 2 is a section taken on the line 2-2 of Fig. 1. l

Referring now to the drawings, it will be vseen that the boiler is inthe shape of a furn'ace, that is to say, the boiler defines its owncombustion chamber. This boiler comprises the drums 7 and 8 and the bankof upright connecting tubes 9 located at the rear; the row of uprighttubes 1() constituting the front wall ofthe combustion chamber; the rowsof Side tubes 11, the upper ends of which are connecting into theheaders 12, and the lower ends of which are connected into the headers13, such headers 12 and 13 being respectively connected to the drum andthe drum 8; the row of roof tubes 14 connected to the drum 7 and totheheader 15, to which latter header the upper' ends of the row of tubes10 are connected; the row of spaced tubes 16, the rear ends of which areconnected into the header 17, in turn connected to the drum 8 and theforward ends of which are connected into the header 18, to which, also,the lower ends of the tubes 10 are connected; the steam drum 19 and thetubes 20 connected to the headers 1`2` for purposes which willhereinafter appear. The tubes 10, 11 and 14 are provided withlongitudinally extending fins 21, to the end that substantiallycontinuous metallic walls are provided vwhich define the combustionspace. The fins on the tubes 10 are interrupted at intervals to provideinlet openings 22 for combustion air, as will further appear.

The baul; of tubes is baffled in any suitable PULVERIZED-COAL-BUBNINGBOILER FURNCE 1926. Serial N0. 116,817.

Way, but it is preferred that it shall be so baffled as to provide anoutlet 23 from the top of the combustion space defined by the front rowof the bank of tubes 9 and the tubes previously described. The coursetaken by the gaseous products of combustion is indicated by the arrows.

VIn the oiftake 24 of the installation I locate an air heater 25 bymeans of which the air for combustion supplied to the combustion spaceis highly preheated.

This air is supplied from the air heater to a casing or fboX 26 at thefront of the boilerfurnace by means of the conduit 27 only a portion ofwhich appears in the drawings..

The powdered coal is admitted to the combustion space near the frontwall at the four corners by means of the burners 28 whichare so disposedas to direct the fuel in streams tangential toa circle after the mannerdiagrammatieally lindicated in Fig. 2. The coal is preferably admittedat high velocity with but a small portion of the air required forcombustion, the balance of the air required for combustion beingadmitted through the inlets 22. K

By reason of this manner of admitting the coal streams, a violentswirling flame is produced, the aXis of which, generally speaking, ishorizontal. Because of the turbulence and intensity of combustion,combustion is completed in a comparatively short space, such combustionbeing normally completed within the 'combustion space defined by thetubes, with the waste gases passing over vthe bank of tubes 9, suchgases, however, leaving at relatively high temperature, whereby highlypreheated Iair for vcombustion may be obtained.

Because of the turbulence of combustion, practically the entire space,with the exception of the corners, is filled with flame, and

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the upright tubes are scoured in a direction The tubes 16 are spacedsufficiently far apart to permit refuse to freely gravitate therebetweento the ash collecting s ace 29.

In order. to secure more unibrm flow through the tubes of the sidewalls, the pipes 20 which take ofi' at different points along the len thof the headers 12 are provided.

For t 1e purpose of controlling the air supply, the dampers and 31 areprovided, these dampers being manipulated to meet the variation infiring conditions resulting from changes in the rate of operating theboiler.

The arrangement is also one which makes it simple to install andmaintain the burner equipment.

Other advantages will occur to those skilled in the art.

I claim:

1. In combination, a combustion chamber, boiler tubes defining thecombustion space thereof, said chamber having an outlet at the rearthereof, and finely divided fuel burners at the front of the chamberarranged to direct fuel inwardly in .a substantially vertical plane andtangent to a'circle to produce a vortical flame, the axis of which isapproximately horizontal.

2. In combination, a combustion chamber, tubular water walls definingthe front, sides and top of the combustion space thereof, upright tubesat the rear of the chamber baiiied to provide an outlet for the gaseousproducts of lcombustion, and a fuel burner adjacent each corner of thechamber at the front therej,

of directed inwardly and arranged in an approximately vertical plane.

3. In combination, a combustion chamber, tubular water walls definingthe front, sides and top of the combustion space thereof, upright tubesat the rear of the chamber baiiicd to provide an outlet for the gaseousproducts of combustion, and a fuel burner adjacent each corner of thechamber at the front thereof directed inwardly and arranged in anapproximately vertical plane, together with a screen of relativelywidely spaced tubes defining the bottom of the combustion space proper,andan ash pit therebelow.

4. In combination, a furnace-shaped tubular boiler, pulverized coalburners arranged to direct coal streams inwardly into the combustionspace provided by the boiler tangent to a circle to produce a vorticalflame, the axis of which is approximatelyhorizontal, means for admittingcombustion air into the combustion cham r adjacent the point of fueladmission and an outlet for the gaseous products of combustion solocated that the line of draft through the combustion space issubstantially horizontal.

5. In combination, a furnace-shaped tubular boiler, pulverized coalburners arranged to direct coal streams inwardly into the combustion sace provided by the boiler tan ent to a circfe to produce a. vorticalflame, t e axis of which is approximately horizontal, means foradmitting preheated combustion air into the combustion chamber adjacentthe point of fuel admission and an outlet for the gaseous products ofcombustion so located that the line of draft throu h the combustionspace is substantially horizontal.

6. In combination, a combustion chamber, tubular Water walls definingthe front, sides and top of the combustion space thereof, upright tubesat the rear of the chamber baffled to provide an outlet for the aseousproducts of combustion, and a fuel urner adjacent each corner of thechamber at the front thereof directed inwardly and arranged in anapproximately vertical plane, together with means for admittingpreheated combustion air into the combustion chamber through the frontwall thereof.

In testimony whereof I have hereunto signed my name.

OTTO DE LORENZI.

